ITE Journal – December 2019 - 35

13 percent after optimal camera allocation. More than 25 percent of
the cameras need to be relocated to ensure maximum efficiency. itej

References

Figure 2. Suggested RLC locations across Chicago intersections.
relocated to ensure optimal efficiency which implies that more than
25 percent of cameras are not located efficiently. A similar procedure
can be used to find the optimal location for a new camera.

Conclusions
In this paper, a Bayesian hierarchical spatial model was developed
for evaluating the effect of RLCs on injury crashes. The proposed
model provides the capability of encountering unobserved heterogeneity in crashes and spatial dependency between intersections
as well as capturing the spillover effect of RLC in the network. The
model was developed using the data from Chicago intersections.
Among the various land-use and intersection characteristics, the
crash frequency was associated with the AADT per lane, the number
of lanes of intersections' approaches, the presence of a divided
median on the minor approach. The results shed further light on
improving the impact of RLCs on intersection safety by reducing the
risk of injury crashes by 6 percent (all collision types). In addition,
2 percent fewer crashes are expected at intersections within 1 km
network distance to the RLC location. From a practical standpoint,
the proposed model for analyzing the RLC performance can result
in a reliable assessment of the program. Also, results of this study
can help previous attempts to investigate the economic feasibility of
RLC programs and the allocation of RLCs in the network to achieve
the highest efficiency.7,33 We defined an optimization problem using
the captured RLC impacts, including the spillover effect, with the
aim of maximizing the efficiency of RLC program in Chicago.
Results show that the system performance can be improved by

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w w w .i t e.or g

D e cember 2019

35


http://www.iihs.org/iihs/topics/t/red-light-running/qanda#cite-text-0-0 http://www.iihs.org/iihs/topics/t/red-light-running/qanda#cite-text-0-0 http://www.cameras.In http://www.Illinois.In http://www.ite.org

ITE Journal – December 2019

Table of Contents for the Digital Edition of ITE Journal – December 2019

President’s Message
Director’s Message
People in the Profession
ITE News
10th Annual ITE Collegiate Traffic Bowl Grand Championship Tournament Recap
Board Committee: Women of ITE: Allies in Design and in the Workplace
Member to Member: Ariel Farnsworth (M)
Calendar
Where in the World?
Industry News
ITE 2019 Year in Review
Impacts of Red-Light Cameras on Intersection Safety: A Bayesian Hierarchical Spatial Model
Dynamic Flashing Yellow Arrow Operations
Advisory Bike Lanes and Shoulders: Current Status and Future Possibilities
Professional Services Directory
ITE Journal – December 2019 - 1
ITE Journal – December 2019 - 2
ITE Journal – December 2019 - 3
ITE Journal – December 2019 - President’s Message
ITE Journal – December 2019 - 5
ITE Journal – December 2019 - Director’s Message
ITE Journal – December 2019 - 7
ITE Journal – December 2019 - People in the Profession
ITE Journal – December 2019 - ITE News
ITE Journal – December 2019 - 10
ITE Journal – December 2019 - 11
ITE Journal – December 2019 - 12
ITE Journal – December 2019 - 13
ITE Journal – December 2019 - 10th Annual ITE Collegiate Traffic Bowl Grand Championship Tournament Recap
ITE Journal – December 2019 - 15
ITE Journal – December 2019 - 16
ITE Journal – December 2019 - Board Committee: Women of ITE: Allies in Design and in the Workplace
ITE Journal – December 2019 - 18
ITE Journal – December 2019 - 19
ITE Journal – December 2019 - Member to Member: Ariel Farnsworth (M)
ITE Journal – December 2019 - Where in the World?
ITE Journal – December 2019 - Industry News
ITE Journal – December 2019 - ITE 2019 Year in Review
ITE Journal – December 2019 - 24
ITE Journal – December 2019 - 25
ITE Journal – December 2019 - 26
ITE Journal – December 2019 - 27
ITE Journal – December 2019 - 28
ITE Journal – December 2019 - Impacts of Red-Light Cameras on Intersection Safety: A Bayesian Hierarchical Spatial Model
ITE Journal – December 2019 - 30
ITE Journal – December 2019 - 31
ITE Journal – December 2019 - 32
ITE Journal – December 2019 - 33
ITE Journal – December 2019 - 34
ITE Journal – December 2019 - 35
ITE Journal – December 2019 - 36
ITE Journal – December 2019 - Dynamic Flashing Yellow Arrow Operations
ITE Journal – December 2019 - 38
ITE Journal – December 2019 - 39
ITE Journal – December 2019 - 40
ITE Journal – December 2019 - 41
ITE Journal – December 2019 - 42
ITE Journal – December 2019 - 43
ITE Journal – December 2019 - Advisory Bike Lanes and Shoulders: Current Status and Future Possibilities
ITE Journal – December 2019 - 45
ITE Journal – December 2019 - 46
ITE Journal – December 2019 - 47
ITE Journal – December 2019 - 48
ITE Journal – December 2019 - 49
ITE Journal – December 2019 - Professional Services Directory
ITE Journal – December 2019 - 51
ITE Journal – December 2019 - 52
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